长[zhǎng] 基本解释：
新英汉大词典：
- 长(長)[zhǎng]
- 形容词- （年纪较大） older; elder; senior:
older than her;比她年长
My brother is senior to me by two years.家兄比我年长两岁。
- （排行最大） eldest; oldest:eldest daughter;长女
eldest brother长兄
- 名词- （领导人） chief; head; leader:
head of a delegation;代表团团长
chairman of the board;董事长
- 动词- （生） come into being; begin to grow; form:
get cancer;长癌
have a boil;长疮
- （生长; 成长） grow; develop:Youth is the time of physical growth.青年时期是长身体的时期。
She has grown so that she is even a little taller than her mother.她长得比母亲都高一点了。
- （增进; 增加） acquire; enhance; increase:increase one's knowledge; gain experience;长见识
Such a tendency is not to be encouraged.此风不可长。
- 长(長)[cháng]
- 形容词- （两端之间的距离大，兼指时间和空间） long:
In summer the days are long and the nights short.夏季昼长夜短。
This is a long river.这条河很长。
- （引申为永远） forever; lasting:depart from the world forever; pass away与世长辞
- 名词- （长度） length:
The length of the bridge is 200 metres.那座桥有200米长。
The boat won by three lengths.这只艇以3艇长之差得胜。
- （长处） strong point; forte:overcome one's shortcomings by learning from others' strong points取人之长，补己之短
- （姓氏） a surname:Chang Wuzi长武子
- 动词- （对某事做得特别好; 擅长） be good at; be strong in:
She is good at painting.; Painting is her forte.她长于绘画。
- 副词- （常） often:
go about sth. little by little without a letup细水长流
例句与用法：
I don't know him well though I've known him for a long time.
She holds the world record for long distance swimming.
I had a long talk with her.
I don't like this long wait.
This line is four times as long as that one.
She was slender and had long dark hair.
How long will it take me to get there?
The bridge is almost 2 kilometers long.